I've been using sagenb for a few weeks now and have the hang of most
of the easy things. Is there a way to generate tables of a user
defined function? I'm still switching over to Excel or the TI
calculator to do that.
Thanks,
-d
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y=|x|
1st derivative should be +1 x0 and -1,X0
f(x) = abs(x)
Dx = x.derivative()
p1 = plot (f(x),(-5,5),color='black')
p2 = plot (Dx, (0,5),color = 'red')
p3 = plot (Dx, (-5,0),color = 'blue')
show (p1+p2+p3)
-d
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Is there a way to label x-axis in terms of pi, say like pi/2, pi, 3pi/2?
Thanks,
-d
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FYI, just started getting this pop-up today on sagenb.com. Things are
working fine once I get past this.
It looks like jsMath failed to set up properly (error code -7). I
will try to keep going, but it could get ugly.
-d
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Two options I can think of, probably a lot more from the elders here:
1) turn off verbose
set_verbose(-1)
f(x) = x^(1/3)
plot(f(x),(-5,5))
2) Don't plot negative
f(x) = x^(1/3)
plot(f(x),(0,5))
-d
At 09:55 AM 12/18/2009, you wrote:
Why when I want
Is there any flexibility on where axis labels are placed? I'd like to
see them under the x axis and vertically along the y. Seems like
there should be more than just axes_labels= tag.
Thanks,
-d
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OK, this should be simple enough, but haven't found a way to add some
text to simple 3d plot:
f(x,y) = x^2 + y^2
plot3d(f, (x,-10,10), (y,-10,10))
Any suggestions?
Thanks,
-d
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Can the user control either to print an approximate value or an exact
value? I tried to print the value of an integral under a bell curve:
integrate(e^((-x^2)), x, -3, 3)
and get:
sqrt(pi)*erf(3)
Thanks,
-d
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Two questions, how to turn off divide by 0 warnings and how to draw a
line over a plot. I was trying to draw a horizontal line at the
equilibrium solution at y = -3.
set_verbose(-1) #Turn off warning
s1 = -3
p1 = plot_slope_field(((y+3)/(1-y)), (x,-6,6), (y,-6,6)).show(aspect_ratio=1)
p2 =
Looking at the published slope field examples, plotting a solution
seemed a bit more difficult than I expected. Some packages just let
you click on the point you want the solution go go through. I don't
expect anything that simple but is there a way to plot a solution on
the slope field if you
Been trying to set up my graphs so I can select fill areas of a
distribution curve. So far all I've been able to do is fill the
entire curve. Any suggestions?
Thanks,
-d
# distribution function
f(x) = 1/sqrt(2*pi)*e^(.5*(-x^2))
# plus/minus 1 sigma
s = 1
p = plot(f,(-pi,pi),ymax = .4,
I'm trying to fill in the bell curve between two points, like plus
and minus 1 sigma.
-d
At 09:19 PM 10/10/2011, you wrote:
What exactly are you trying to fill? Can you find a picture showing
an example of what you are trying to achieve?
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I've used sage for a while now and have used the vector field for
equations. I'm a bit stumped on this one. I want to make an 2D
electric field chart from an array of voltage measurements like an
isobar chart only lines of equal voltage potential. I've searched,
but haven't found sample code.
YES! I couldn't think of the term. I'll go back to searching for that.
Thank you,
-d
At 06:25 PM 6/4/2012, you wrote:
On Monday, June 4, 2012 3:12:00 PM UTC-7, Dan Aldrich wrote:
I've used sage for a while now and have used the vector field for
equations. I'm a bit stumped on this one. I
Well, I spoke too soon. I can plot the matrix, but not contour_plot it.
V = matrix([
[0.020, 0.020, 0.016, 0.014, 0.011, 0.011],
[0.021, 0.018, 0.016, 0.013, 0.010, 0.011],
[0.017, 0.015, 0.015, 0.012, 0.010, 0.011],
[0.013, 0.013, 0.011, 0.009, 0.007, 0.009],
[0.011, 0.010,
Thank you Jason. That is very close to what I was looking for. I
turned off the fill. Is there a way to label each contour line? I'd
like to label the voltage gradient on the line like a topographic map.
-d
At 09:13 PM 6/4/2012, you wrote:
There are several things you could do:
Use the
Trying to read in a .csv file into sagenb.
data = list(csv.reader(file('C:/Documents and Settings/Dan/My
Documents/Lab6.csv')))
Then I thought about using a file dialog instead:
import csv
import tkFileDialog
filename = tkFileDialog.askopenfilename()
csvfile = open(filename, rb)
But that
I think it's a file path problem, that's why I tried the file open
dialog. I took a look at my path:
'/sagenb/servers/sage_notebook-sagenb.sagenb/home/daldrich/24/data/'
But that's on the sagenb server. Is there a way to upload my csv?
That might make things simpler.
-d
At 01:43 PM
One of my worksheet's contents has just disappeared. The worksheet is
still listed on sagenb.org as an active worksheet, but when I open
it, nothing happens.
Not a major crisis, I was able to recover most of it from .zips I
make and D/L, but just wanted to let someone know about it.
-d
--
PM 6/23/2012, you wrote:
On 6/23/12 2:07 PM, Dan Aldrich wrote:
One of my worksheet's contents has just disappeared. The worksheet is
still listed on sagenb.org as an active worksheet, but when I open it,
nothing happens.
Not a major crisis, I was able to recover most of it from .zips I make
I inserted text in one of my graphs to show the RC constant (tau)
of a cap. That would be the unicode character you're seeing. Something like:
text($\\tau$ = 0,(tau + .02 ,f(tau)))
-d
At 10:52 PM 6/23/2012, you wrote:
Interesting. I see errors in the server log about unicode
characters,
I'm trying to recover a worksheet that doesn't open on sagnb. I
downloaded and unziped the files. What format are the SWS files in?
-d
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Thank you. I tried winrar beforehand and the content was mangled.
I'll get a copy on my mac and try tar. Perhaps the worksheet is
mangled on the sagenb server and that's the root problem with this
one worksheet.
-d
At 11:07 AM 7/17/2012, you wrote:
On 7/17/12 9:59 AM, Dan Aldrich wrote
I know you've had problems w/ malicious user(s). How long will public
worksheets be disabled?
-d
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Is there a 'solve' type operator to solve the resultant of adding 3
different phasors?
6*e^(30*i) + ComplexNumber(-3,5) + 1*e^(45*i)
Thanks,
-d
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Haven't been able to access sagenb.org or .com for over a day. Is
this a long term outage?
Thank you,
-d
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Can't seem to get the convolution of these two functions.
f(t) = unit_step(t) - unit_step(t-3)
g(t) = unit_step(t) - unit_step(t-1)
Matlab (argghh...) does it simply: conv(f,g). I tried the methods
in the documentation: z = f.convolution(g), but no no luck getting it
to work in sage.
Is there a way to have folders in sagenb to contain your
worksheets? Would help organizing your worksheets.
-d
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OK, this doesn't get me kicked off the list, nothing will...
Has anyone considered porting sage over to the raspberry pi?
-d
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To
Just noticed today that worksheets I've made over the last few weeks have been
not appearing in my active worksheet list. Anyone else seeing this?
-d
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I'm looking for a library to do Routh–Hurwitz
stability calculations. Are there any libraries
in Sage that do this? Couldn't find them in scipy/numpy etc.
Thanks,
-d
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I'm still having problems with worksheets getting lost. My older worksheets
seem to be in place. Sometimes it happens the same day, I write a worksheet in
the morning and in the evening it doesn't appear when I log in at home.
-d
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I use sagenb.org which redirects me to www.sagenb.org. I use my username/PW,
I've been using sage before the google/FB authentication. My username is
daldrich.
-d
On Apr 17, 2013, at 6:19 PM, Jason Grout jason-s...@creativetrax.com wrote:
Are you talking about sagenb.org? Which server are
OK, I just created a worksheet, foo1: http://www.sagenb.org/home/daldrich/47/
Been using sage for years now, I've never explicitly saved my worksheets. This
one I created, ran, then logged off. Logging back on, it was there so don't
think that's the problem.
There are lost worksheets, sorry
sagenb.org definitely redirects me to http://www.sagenb.org
-d
On Apr 17, 2013, at 6:19 PM, Jason Grout jason-s...@creativetrax.com wrote:
On 4/17/13 5:11 PM, Dan Aldrich wrote:
I'm still having problems with worksheets getting lost. My older worksheets
seem to be in place. Sometimes
I'm trying to put a point on a contour plot.
p1 = contour_plot(f(x,y), (x,-10,10),(y,-10,10))
p2 = point((0,0), color = 'red', point size = 30)
show(p1+p2)
I think the problem is apples and oranges related. Is there a way to do this?
Thanks,
-d
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Do complex variables have methods associated to do angle or magnitude
of them? Just wondering if I need to write my own functions or
they're already there.
Thanks,
-d
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Does sage have any functions for div/grad/curl/del squared?
Thanks,
-d
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A while back I mentioned that I was losing worksheets. I noticed
today what was going on.
I select new worksheet, but I don't get a new worksheet, but an older
(usually the last opened) and comes up w/ a rename panel. Sometimes
the worksheet number gets updated (daldrich/47 to daldrich/48)
Trying to format the output of a matrix, B. Sage reports: type 'print
obj.str()' to see all of the entries)
But print B.str() doesn't give me any format options. Is there a way control
output like a regular print statement?
Thanks,
-d
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Password recovery for ask.sagemath doesn't seem to be working.
-d
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To
Trying to solve a reliability problem, to find lamda and mu, is there a way to
get a numerical result? I tried a couple different variations of solve, but
never got it in terms of just lambda or mu.
Thanks,
-d
lamda = var('lamda')
mu = var('mu')
a2 = .5*(3*lamda + mu) - (.5*sqrt((lamda^2 +
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